PLCs: Advantages - Reliability

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What is a PLC?

A specialized electronic device for controlling industrial machinery (correct)
A household appliance
A type of smartphone
A type of personal computer

In PLCs, what do the five standard programming languages refer to?

Five programming languages defined in IEC 61131 standard (correct)
Five types of sensors used in PLCs
Five different communication protocols in PLCs
Five different types of hardware used in PLCs

What is a key advantage of PLCs in terms of reliability?

They are made of fragile components
They are prone to frequent breakdowns
They are industrial computers that operate in harsh environments (correct)
They can only operate in controlled environments

How do PLCs benefit maintenance and troubleshooting processes?

They simplify maintenance and troubleshooting tasks (A) Signup and view all the answers

What are PLCs mainly used for in industrial settings?

Controlling manufacturing machines and systems (A) Signup and view all the answers

Which standard specifies the five programming languages commonly used in PLCs?

IEC 61131 (D) Signup and view all the answers

What is a key advantage of PLCs over relays when it comes to reliability?

PLCs do not require physical wear like relays do. (A) Signup and view all the answers

How does off-line programming of PLCs differ from installing and modifying RLL circuits?

Off-line programming can be completed in minutes while installing RLL circuits takes days or weeks. (B) Signup and view all the answers

In ladder logic, what does each rung represent?

A logical statement executed in software (B) Signup and view all the answers

In on-line programming with PLCs, what can be edited while the PLC controls the production system?

The ladder logic program (D) Signup and view all the answers

What is the limitation on the number of virtual relays and input/output instructions in a PLC?

Memory size (D) Signup and view all the answers

How do PLC input instructions differ from ladder logic switches?

PLC input instructions are logical symbols associated with voltage at input module terminals (C) Signup and view all the answers

Why is maintenance and troubleshooting easier with PLCs compared to traditional relay control systems?

Changing a module or processor in a PLC does not require any wiring changes. (D) Signup and view all the answers

What is a key advantage of using separate power sources for PLC input and output devices?

Increased isolation from processor power (A) Signup and view all the answers

What is a significant advantage of using PLCs in a production system with varying requirements?

PLCs can control many different applications with only program and module changes. (D) Signup and view all the answers

Which characteristic of PLCs contributes significantly to their reliability compared to relay systems?

Reliability inherent in electronic devices (D) Signup and view all the answers

Which statement best describes the PLC rung output in ladder logic?

It is a discrete output instruction or bit in memory (A) Signup and view all the answers

Why can outputs be paralleled on the same rung in ladder logic programming?

To simplify wiring modifications (B) Signup and view all the answers